How to insert data in array of 0 object in mongodb

Question

This is my structure of mongodb. I need to add field in 0 object of array. Can some one please help

_id:ObjectId("5c2cdb3cdd03242b5c15965a")
    Article:Array
    0:Object
    name:"dublin"

I tried this but it is not working.

 db.myCollection.update({_id:ObjectId("5c2cdb3cdd03242b5c15965a")},{$set:{Article:[{regarding:"nodeDeveloper"}]}})

I need output like this

_id:ObjectId("5c2cdb3cdd03242b5c15965a")
Article:Array
0:Object
name:"dublin"
regarding:"nodeDeveloper"